Bolt shattered the world records in the 100 and 200 meters at the World Championships in Berlin, shaving a stunning .11 off each. It was so remarkable a performance that it instantly brought forth questions about whether Bolt was using performance-enhancing drugs. Track fans have been burned so many times before (Tim Montgomery, Marion Jones, etc.) that a little skepticism is healthy. But for now, in the absence of proof that Bolt cheated, he makes the list.
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